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99e5777448
The ${foo#unit} syntax didn't really make sense because it created
a large number of potential error conditions on the assignment side
and didn't help with finding compatible fields.
With all this moved to the match side, an invalid syntax simply causes
a mismatch.
36 lines
638 B
Plaintext
36 lines
638 B
Plaintext
REF=R[0-9]* {
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T=R
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VAL=(#R) { R=$1 }
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TOL = 5%
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FN=*% { TOL=$$ }
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break REF
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// end break again
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}
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/*
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pattern:
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() | like in RE
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* ? like in glob
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(#U) expect a numeric value of unit U (use substring to get canonical value)
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subst: $1 ... $field
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substring:
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$1, $2, ...
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variable:
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$foo, ...
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with curly braces:
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${foo}, ...
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input variable:
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$$
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Caveat:
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Wrong: FN=* { X=$FN } there is no variable called FN
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Right: FN=* { X=$$ } yields the Fn field selected by FN
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Wrong: VAL=(#R) { R=$VAL } yields literal value
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Wrong: VAL=(#R) { R=$$ } yields literal value
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Right: VAL=(#R) { R=$1 } yield canonicalized value
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*/
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